There are acid cleansers and toners, washes and scrubs. There’s dermaplaning. There are retinoids. In-office peels. A guide to solve the mystery of exfoliating, once and for all.

Shopping for makeup is fun, but shopping for makeup when it's on sale has to be one of life's greatest joys. Starting today through June 29, Sigma Beauty is bringing that joy to our lives with its semiannual sale, where you can score up to 75 percent (!) off some of its bestsellers, plus free US shipping on orders over $30. Discounted goodies include color cosmetics (like liquid lipsticks for o...